WO2022022455A1

WO2022022455A1 - Contactless counter-pressure filling valve

Info

Publication number: WO2022022455A1
Application number: PCT/CN2021/108421
Authority: WO
Inventors: 沈军; 高擎宇; 丁赟
Original assignee: 江苏新美星包装机械股份有限公司
Priority date: 2020-07-27
Filing date: 2021-07-26
Publication date: 2022-02-03
Also published as: CN111977594A

Abstract

A contactless counter-pressure filling valve comprises a valve seat (1), a valve stem (4), and a sealing valve block (5) at the bottom of the valve seat (1). The sealing valve block (5) is sealingly and engagingly sleeved on a lower portion of the valve seat (1). A lower portion of the sealing valve block (5) has a channel through which a mouth of a container (6) can pass. A sealing structure used to engage with an outer peripheral wall of the mouth of the container (6) is provided on an inner peripheral wall of a lower end of the channel. The sealing structure is located below a valve port (3). When the sealing structure and the outer peripheral wall of the mouth of the container (6) engage with each other, a gap (7) is present in a vertical direction between a bottom end surface of the valve port (3) and a top end surface of the mouth of the container (6). The contactless counter-pressure filling valve ensures that the mouth of a container (6) and the counter-pressure filling valve do not contact each other during filling, thereby improving cleanliness during filling, and solving the problem in which a sealing gasket at the bottom of a conventional filling valve contaminates the mouth of a container.

Description

Non-contact isobaric filling valve

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of the Chinese Patent Application No. 202010729241.5 filed with the China Patent Office on July 27, 2020, the entire contents of which are incorporated herein by reference.

technical field

The invention relates to the technical field of filling valves, in particular to an isobaric filling valve.

Background technique

Isobaric filling, also known as pressure gravity filling. Based on the characteristics of gas-containing liquids, in order to reduce the overflow of gas in the liquid, it is necessary to introduce gas, such as carbon dioxide, into the packaging container in advance to make it equal to the air pressure in the liquid cylinder, and then fill and return the gas, which is generally used for gas-containing liquids. Beverage filling production.

The structure of the current isobaric filling valve mainly includes: a valve seat, a valve cavity is arranged inside the valve seat, a valve port is arranged at the lower end of the valve seat, a valve stem is arranged in the valve cavity, and the valve stem is hollow to form a return air pipe, The valve stem is connected with the lift drive mechanism, and a sealing mechanism is arranged between the valve stem in the valve cavity and the inner wall of the valve cavity above the valve port. The lift drive mechanism can drive the valve stem to move up and down relative to the valve seat, thereby driving the sealing mechanisms to seal each other so that The valve port is disconnected from the valve cavity and the valve is closed, or the sealing mechanism is driven to release the seal so that the valve port is connected with the valve cavity and the valve is opened. The blocking step, a sealing gasket used to seal the mouth of the container during filling is arranged between the blocking step connecting the valve block and the bottom of the valve port end.

The above-mentioned isobaric filling valve is installed at the bottom of the liquid cylinder for holding the material liquid. Partially connected. The isobaric filling valve is provided with a clamping block for clamping the container, and the clamping block can clamp the container and move upward, so that the mouth of the container is sealed and pressed against the bottom of the sealing gasket. Before filling, the back pressure gas in the liquid cylinder enters the container through the air return pipe. After that, the valve is opened, and the liquid in the liquid cylinder enters the container through the valve cavity and valve port for filling.

The defect of the above-mentioned isobaric filling valve is: every time the container is filled, the mouth of the container is in contact with the sealing gasket, and the sealing gasket is easily contaminated with the material liquid, and the material liquid on the sealing gasket will be contaminated to the mouth of the next container. , thereby causing pollution to the mouth of the container and bringing about potential health and safety hazards.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a non-contact isobaric filling valve to avoid contact between the valve port and the container port during the filling process, thereby improving the filling cleanliness and ensuring the filling quality of the material liquid.

In order to solve the above problems, the first technical solution adopted by the present invention is: a non-contact isobaric filling valve, comprising a valve seat and a valve stem, the valve seat is provided with a valve cavity, and the bottom of the valve seat has a The valve port communicated with the valve cavity, the valve stem extends in the up-down direction and is arranged in the valve cavity to be relatively movable in the up-down direction, and the valve stem has a return air pipe extending through the up-down direction, so The outer peripheral part of the valve stem is provided with a sealing member, the inner wall of the valve cavity is provided with a blocking part, the blocking part is located above the valve port, and the filling valve has a closed state and an open state. In the valve state, when the valve is in the closed state, the sealing member and the blocking portion are in sealing cooperation with each other, so that the valve port and the valve cavity are isolated from each other and not communicated with each other; when the valve is in the open state, the The sealing member is disengaged from the blocking portion, the valve port and the valve cavity are communicated with each other,

The isobaric filling valve further includes a sealing valve block, the sealing valve block is sleeved on the lower part of the valve seat in a sealing fit, and the lower part of the sealing valve block has a channel for the mouth of the container to penetrate, the The inner peripheral wall of the lower end of the channel is provided with a sealing flange extending radially inwardly, and the outer peripheral wall of the container mouth has a support ring that protrudes radially outwards, and the outer diameter of the supporting ring is larger than The inner diameter of the sealing flange, and the support ring is located below the top end surface of the container mouth, the sealing flange can abut against the support ring downward, so that the sealing valve block A seal is formed with the mouth of the container,

Wherein, when the filling valve is in the closed valve state and the sealing flange can abut against the support ring downward, the bottom end face of the valve port and the top end face of the container port are A gap of 2mm to 5mm is formed between them in the up-down direction, the valve stem protrudes downward to the bottom of the valve port and can be inserted downward into the container port, and the sealing valve block is internally formed with the The isobaric chambers where the return gas pipelines communicate with each other.

The second technical solution adopted by the present invention is: a non-contact isobaric filling valve, comprising a valve seat and a valve stem, the valve seat is provided with a valve cavity, and the bottom of the valve seat is connected to the valve cavity The valve stem extends in the up-down direction and is arranged in the valve cavity to be relatively movable in the up-down direction. The valve stem has a return air pipe extending through the up-down direction. A sealing part is arranged on the peripheral part, and a blocking part is arranged on the inner wall of the valve cavity, and the blocking part is located above the valve port. The filling valve has a valve-closed state and an open-valve state. In the closed valve state, the sealing member and the blocking portion are in sealing cooperation with each other, so that the valve port and the valve cavity are isolated from each other and not communicated with each other; when the valve is in the open state, the sealing member and the The blocking part is disengaged, the valve port and the valve cavity communicate with each other,

The isobaric filling valve further includes a sealing valve block, the sealing valve block is sleeved on the lower part of the valve seat in a sealing fit, and the lower part of the sealing valve block has a channel for the mouth of the container to penetrate, the The inner peripheral wall of the lower end of the channel is provided with a sealing structure for sealing and matching with the outer peripheral wall of the container mouth, the sealing structure is located below the valve port, and when the sealing structure is connected to the outer side of the container mouth When the peripheral walls cooperate with each other, there is a gap between the bottom end face of the valve port and the top end face of the container mouth along the up-down direction.

In some embodiments, the lower inner peripheral wall of the channel has a sealing flange extending radially inwardly, and the sealing flange constitutes the sealing structure; the outer peripheral wall of the container mouth has A support ring protruding radially outwards, the sealing flange abuts on the support ring downward, so that a seal is formed between the sealing valve block and the mouth of the container; the outer surface of the support ring The diameter is larger than the inner diameter of the sealing flange, and the support ring is located below the top surface of the mouth of the container.

In some embodiments, when the filling valve is in the closed valve state and the sealing structure cooperates with the outer peripheral wall of the container mouth, the valve stem extends downward to the valve mouth and can be inserted downward into the mouth of the container.

In some embodiments, when the sealing structure cooperates with the outer peripheral wall of the mouth of the container, an isobaric cavity is formed inside the sealing valve block that communicates with the gas return pipe.

In some embodiments, the gap is 2 mm to 5 mm.

In some embodiments, the outer peripheral wall of the lower portion of the valve seat is provided with a connecting portion that protrudes outward, the sealing valve block and the connecting portion are threadedly connected, and the sealing valve block A circumferential seal is arranged between the inner peripheral portion of the valve block and the outer peripheral portion of the connecting portion, and an axial sealing structure is also arranged between the sealing valve block and the connecting portion, and the axial sealing structure is located at the below the circumferential seal.

In some embodiments, the axial sealing structure includes a blocking step disposed on the inner peripheral wall of the upper end of the sealing valve block, and a sealing ring disposed between the bottom of the connecting portion and the blocking step .

In some embodiments, the inner diameter of the valve port is smaller than the inner diameter of the container port.

In some embodiments, an exhaust passage is provided on the valve seat, the exhaust passage extends in an up-down direction, and the lower part of the exhaust passage communicates with the valve port.

In some embodiments, the bottom end surface of the valve seat is a downwardly convex conical surface with a gradually decreasing outer diameter.

The third technical solution adopted by the present invention is: a non-contact isobaric filling valve, comprising: a valve seat, a valve cavity is arranged in the valve seat, a valve port that can be communicated with the valve cavity is provided at the bottom of the valve seat, and a valve cavity is arranged in the valve cavity The valve stem is axially hollow inside the valve stem to form a return air pipeline. The valve stem in the valve cavity is provided with a sealing part, and the inner wall of the valve cavity above the valve port is provided with a blocking part. The action of the valve stem can drive the sealing part on the valve stem. The blocking part of the seal is blocked on the inner wall of the valve cavity, so that the valve port and the valve cavity are isolated from each other and the valve is closed, or the sealing part on the valve stem is driven to disengage from the blocking part of the inner wall of the valve cavity, so that the valve port is connected with the valve cavity. When the valve is opened, the valve seat at the end of the valve port is provided with a sealing valve block, and the inner wall of the lower end of the sealing valve block is provided with a sealing flange protruding inward, and the sealing flange is used for sealing and blocking the outer wall of the container port. On the support ring above, when the sealing flange seal is blocked on the support ring of the container, there is a gap between the mouth of the container and the bottom of the valve port, and the sealing valve block above the support ring is formed to communicate with the return gas pipeline. the isobaric chamber.

In some embodiments, the outer wall of the valve seat at the valve port is provided with a connecting portion protruding outward, the inner wall of the upper end of the sealing valve block is provided with a blocking step, and the sealing valve block and the connecting portion are threadedly sealed. , the bottom of the connecting part is provided with a sealing ring, and the blocking step of the sealing valve block is sealed and blocked on the sealing ring.

In some embodiments, the inner diameter of the valve opening is smaller than the inner diameter of the container mouth.

In some embodiments, when the sealing flange is sealed on the support ring of the container, and the valve is in a closed valve state in which the valve port and the valve cavity are isolated from each other, the lower port of the return gas pipeline protrudes into the container and is located at the mouth of the container .

In some embodiments, when the sealing flange is blocked on the support ring of the container, the gap between the mouth of the container and the bottom of the valve mouth is 2 mm˜5 mm.

In some embodiments, an exhaust passage is formed on the valve seat, and the exhaust passage communicates with the valve port below the sealing member.

In some embodiments, the bottom surface of the valve body outside the bottom of the valve port is a tapered surface gradually inclined downward from the sealing valve block to the direction of the valve port.

Compared with the prior art, the present invention has the following advantages: during the filling process, a seal is formed between the mouth of the container and the sealing valve block, and a certain amount of space can be retained between the mouth of the container and the bottom of the valve mouth along the up-down direction. This ensures that there is no contact between the mouth of the container and the isobaric filling valve during each filling, thus greatly improving the cleanliness of filling. The overall structure of the isobaric filling valve is simple, the installation is also very convenient, and the practicability is good, which effectively solves the technical problem that the sealing gasket at the bottom of the traditional filling valve contaminates the mouth of the container.

Description of drawings

FIG. 1 is a schematic structural diagram of the non-contact isobaric filling valve according to the present invention in the filling structure.

Among them: 1- valve seat; 11- connecting part; 12- sealing ring; 13- exhaust channel; 101- cone surface; 2- valve cavity; 3- valve port; 4- valve stem; 41- air return pipe; 42 - sealing parts; 5- sealing valve block; 50- isostatic cavity; 51- sealing flange; 52- blocking step; 6- container; 61- supporting ring; 7- clearance; 8- clamping block.

detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments.

The non-contact isobaric filling valve shown in Figure 1 includes: a valve seat 1 and a valve stem 4, a valve chamber 2 is arranged in the valve seat 1, and the bottom of the valve seat 1 also has a valve port that communicates with the valve chamber 2 3. The inner diameter of the valve port 3 is smaller than the inner diameter of the mouth of the container 6 . The valve rod 4 extends in the up-down direction, and is disposed in the valve chamber 2 so as to be relatively slidable in the up-down direction. The inside of the valve stem 4 is hollow in the axial direction, and has a return air pipe 41 extending through the up and down direction. The outer peripheral portion of the valve stem 4 is provided with a sealing member 42, and the inner wall of the valve cavity 2 is provided with a blocking portion 21. The blocking portion 21 is located above the valve port 3 . With the up and down movement of the valve stem 4, the isobaric filling valve has a switchable valve closing state and an open valve state. When the valve is in the closing state, the valve stem 4 moves downward, and the sealing member 42 and the blocking portion 21 Seal and cooperate with each other, so that the valve port 3 and the valve cavity 2 are isolated from each other and are not connected to each other; when the valve is in the open state, the valve stem 4 moves upward, and the sealing member 42 is disengaged from the blocking part 21, so that the valve port 3 and the valve cavity are disengaged. 2 are connected to each other.

The isobaric filling valve also includes a sealing valve block 5, which is sleeved on the lower part of the valve seat 1 in a sealing fit, and the lower part of the sealing valve block 5 has a channel for the mouth of the container 6 to penetrate, and the channel The inner peripheral wall of the lower end is provided with a sealing structure for sealing and matching with the outer peripheral wall of the mouth of the container 6, the sealing structure is located below the valve port 3, and when the above-mentioned sealing structure cooperates with the outer peripheral wall of the mouth of the container 6, the valve port There is a gap in the vertical direction between the bottom end surface of 3 and the top end surface of the mouth of container 6 .

Specifically, in this embodiment, the inner wall of the lower end of the sealing valve block 5, that is, the inner peripheral wall of the lower part of the channel of the sealing valve block 5, has a sealing flange 51 that protrudes inward in the radial direction. The rim 51 is used to form the above-mentioned sealing structure. The outer peripheral wall of the mouth of the container 6 has a support ring 61 that protrudes outward in the radial direction. The outer diameter of the support ring 61 is slightly larger than the inner diameter of the sealing flange 51. When the ring 61 is on, a seal is formed between the two, that is, a seal is formed between the inner peripheral portion of the sealing valve block 5 and the outer peripheral portion of the container 6. The equal pressure chamber 50 communicated with the return gas pipeline 41 .

When the sealing flange 51 is sealed on the support ring 61 of the container 6, a gap 7 is left between the mouth of the container 6 and the bottom of the valve port 3. In this embodiment, the mouth of the container 6 and the bottom of the valve port 3 The specific size a of the gap 7 between them is 2-5 mm, so as to ensure that the valve port 3 does not contact the container 6 during filling.

In this embodiment, when the sealing flange 51 is sealed and blocked on the support ring 61 of the container 6, and the isobaric filling valve is in the closed valve state in which the valve port 3 and the valve cavity 2 are isolated from each other, the valve stem 4 downwards It protrudes below the valve port 3 and can be inserted downward into the mouth of the container 6 , so that the lower port of the air return pipe 41 protrudes into the container 6 and is located at the mouth of the container 6 .

Referring to FIG. 1 , in this embodiment, the connection structure between the sealing valve block 5 and the valve seat 1 includes: the outer peripheral wall of the lower part of the valve seat 1 is provided with a connecting portion 11 that protrudes and extends outward, and the sealing valve block 5 Threaded connection with the connecting part 11, and a circumferential seal (not shown in the figure) is provided at the threaded connection to realize the sealing connection between the inner peripheral part of the sealing valve block 5 and the outer peripheral part of the connecting part 11 ; An axial sealing structure is also provided between the sealing valve block 5 and the connecting portion 11, and the axial sealing structure is located below the above-mentioned circumferential sealing member. Specifically, the axial sealing structure includes a blocking step 52 provided on the inner peripheral wall of the upper end of the sealing valve block 5, and a sealing ring 12 provided between the bottom of the connecting portion 11 and the blocking step 52, and the thread seals The sealing of the two in the circumferential direction is realized, and the sealing ring 12 realizes the sealing in the axial direction of the two, and the sealing position in the axial direction is below the sealing position in the circumferential direction. In this way, the two seals in the circumferential direction and the axial direction ensure the sealing effect.

In addition, an exhaust passage 13 is provided on the valve seat 1 , and the exhaust passage 13 extends in the up-down direction and communicates with the valve port 3 at the lower part. The bottom end surface of the valve seat 1 outside the bottom of the valve port 3 is a tapered surface 101 that slopes downward gradually from the sealing valve block 5 to the direction of the valve port 3 . The bottom surface of the valve seat 1 on the outer side of the bottom of the valve port 3 is set as a conical surface 101, which can more effectively prevent the bottom of the valve port 3 from being contaminated with the feed liquid, thereby further effectively avoiding contamination of the container mouth.

During the isobaric filling process, the container 6 is held by the clamping block 8, the mouth of the container 6 extends from the channel of the sealing valve block 5 into the sealing valve block 5 from bottom to top, and the mouth of the container 6 is located in the valve block 5. Just below the port 3, the sealing flange 51 of the sealing valve block 5 and the support ring 61 are sealed and blocked, the sealing valve block 5 above the support ring 61 forms an isobaric cavity 50, and the lower end of the valve stem 4 extends into the container 6 of the mouth. In order to minimize the separation of gas and liquid in the material during filling, the exhaust channel 13 is closed, and the back pressure gas in the liquid cylinder first enters the container 6 through the return gas pipeline 41, and then enters the isobaric chamber 50, and then Fill it. After the filling is completed, open the exhaust channel 13 to exhaust. During each filling, a seal is formed between the sealing flange 51 of the sealing valve block 5 and the support ring 61 on the container 6, and there is no contact between the top surface of the mouth of the container 6 and the isobaric filling valve, which greatly improves the performance of the filling valve. Filling cleanliness.

To sum up, in the present invention, the sealing valve block 5 is arranged on the valve seat 1 at the position of the valve port 3, and the sealing flange 51 is arranged on the inner wall of the lower end of the sealing valve block 5, and the sealing flange 51 is used for sealing the card. On the support ring 61 blocked on the outer wall of the mouth of the container 6, when the sealing flange 51 is sealed and blocked on the support ring 61 of the container 6, there is a gap between the top surface of the mouth of the container 6 and the bottom end surface of the valve port 3. The structure of the gap 7 ensures that there is no contact between the mouth of the container 6 and the isobaric filling valve during each filling, thus greatly improving the cleanliness of filling. The overall structure of the isobaric filling valve is simple, the installation is also very convenient, and the practicability is good, which effectively solves the technical problem that the sealing gasket at the bottom of the traditional filling valve contaminates the mouth of the container.

Claims

A non-contact isobaric filling valve comprises a valve seat and a valve stem, a valve cavity is arranged in the valve seat, the bottom of the valve seat has a valve port communicated with the valve cavity, and the valve stem is along the The valve rod extends in the vertical direction and is arranged in the valve cavity so as to be relatively movable in the vertical direction. A blocking portion is provided on the inner wall of the valve cavity, and the blocking portion is located above the valve port,

The isobaric filling valve has a closed valve state and an open valve state. When in the closed valve state, the sealing member and the blocking portion are sealed and cooperated with each other, so that the valve port and the valve cavity are isolated from each other. They are not connected to each other; when the valve is in the open state, the sealing member is disengaged from the blocking portion, and the valve port and the valve cavity are communicated with each other, which is characterized in that:

The isobaric filling valve further includes a sealing valve block, the sealing valve block is sleeved on the lower part of the valve seat in a sealing fit, and the lower part of the sealing valve block has a channel for the mouth of the container to penetrate, the The inner peripheral wall of the lower end of the channel is provided with a sealing flange extending radially inwardly, and the outer peripheral wall of the container mouth has a support ring that protrudes radially outwards, and the outer diameter of the supporting ring is larger than The inner diameter of the sealing flange, and the support ring is located below the top end surface of the container mouth, the sealing flange can abut against the support ring downward, so that the sealing valve block A seal is formed with the mouth of the container,

Wherein, when the isobaric filling valve is in the closed valve state, and the sealing flange can abut against the support ring downward, the bottom end surface of the valve port and the container port are in contact with each other. A gap of 2 mm to 5 mm is formed between the top surfaces along the vertical direction, the valve stem extends downward to the bottom of the valve port and can be inserted into the container port downward, and the sealing valve block is formed inside An isobaric chamber communicated with the return gas pipeline.
A non-contact isobaric filling valve comprises a valve seat and a valve stem, a valve cavity is arranged in the valve seat, the bottom of the valve seat has a valve port communicated with the valve cavity, and the valve stem is along the The valve rod extends in the vertical direction and is arranged in the valve cavity so as to be relatively movable in the vertical direction. A blocking portion is provided on the inner wall of the valve cavity, and the blocking portion is located above the valve port,

The isobaric filling valve has a closed valve state and an open valve state. When in the closed valve state, the sealing member and the blocking portion are sealed and cooperated with each other, so that the valve port and the valve cavity are isolated from each other. They are not connected to each other; when the valve is in the open state, the sealing member is disengaged from the blocking portion, and the valve port and the valve cavity are communicated with each other, which is characterized in that:

The isobaric filling valve further includes a sealing valve block, the sealing valve block is sleeved on the lower part of the valve seat in a sealing fit, and the lower part of the sealing valve block has a channel for the mouth of the container to penetrate, the The inner peripheral wall of the lower end of the channel is provided with a sealing structure for sealing and matching with the outer peripheral wall of the container mouth, the sealing structure is located below the valve port, and when the sealing structure is connected to the outer side of the container mouth When the peripheral walls cooperate with each other, there is a gap between the bottom end face of the valve port and the top end face of the container mouth along the up-down direction.
The non-contact isobaric filling valve according to claim 1, wherein the inner peripheral wall of the lower part of the channel has a sealing flange protruding radially inward, and the sealing flange constitutes the Sealed structure.
The non-contact isobaric filling valve according to claim 3, wherein the outer peripheral wall of the container mouth has a support ring that protrudes outward in the radial direction, and the sealing flange abuts downward against on the support ring, so that a seal is formed between the sealing valve block and the mouth of the container.
The non-contact isobaric filling valve according to claim 4, wherein the outer diameter of the support ring is larger than the inner diameter of the sealing flange, and the support ring is located on the top surface of the container mouth. below.
The non-contact isobaric filling valve according to claim 1, wherein when the filling valve is in the closed valve state and the sealing structure cooperates with the outer peripheral wall of the container mouth, The valve stem protrudes downwards below the valve port and can be inserted downwardly into the container port.
The non-contact isobaric filling valve according to claim 1, wherein when the sealing structure and the outer peripheral wall of the container mouth cooperate with each other, the sealing valve block is formed with the air return pipeline inside. Interconnected isobaric chambers.
The non-contact isobaric filling valve according to claim 1, wherein the gap is 2 mm to 5 mm.
The non-contact isobaric filling valve according to claim 1, wherein the outer peripheral wall of the lower part of the valve seat is provided with a connecting part that protrudes and extends outward, and the sealing valve block and the connecting part They are connected in a threaded manner, and a circumferential sealing member is arranged between the inner peripheral portion of the sealing valve block and the outer peripheral portion of the connecting portion, and a peripheral sealing member is also arranged between the sealing valve block and the connecting portion. An axial sealing structure, the axial sealing structure is located below the circumferential seal.
The non-contact isobaric filling valve according to claim 9, wherein the axial sealing structure comprises a blocking step provided on the inner peripheral wall of the upper end of the sealing valve block, and a blocking step provided on the connecting portion The sealing ring between the bottom and the blocking step.
The non-contact isobaric filling valve according to claim 1, wherein the inner diameter of the valve port is smaller than the inner diameter of the container port.
The non-contact isobaric filling valve according to claim 1, wherein the valve seat is provided with an exhaust channel, the exhaust channel extends in the up-down direction, and the exhaust channel is connected to the lower part of the exhaust channel. The valve ports are communicated.
The non-contact isobaric filling valve according to claim 1, wherein the bottom end surface of the valve seat is a conical surface that protrudes downward and has a gradually decreasing outer diameter.
A non-contact isobaric filling valve, comprising: a valve seat, a valve cavity is arranged in the valve seat, a valve port which can be communicated with the valve cavity is provided at the bottom of the valve seat, a valve stem is arranged in the valve cavity, and the inside of the valve stem is formed by an axial hollow. In the air return pipeline, the valve stem in the valve cavity is provided with a sealing part, and the inner wall of the valve cavity above the valve port is provided with a blocking part. The part makes the valve port and the valve cavity separate from each other and closes the valve, or drives the sealing part on the valve stem to disengage from the blocking part of the inner wall of the valve cavity, so that the valve port is connected with the valve cavity to open the valve, which is characterized in that: the valve port The valve seat at the end is provided with a sealing valve block, and the inner wall of the lower end of the sealing valve block is provided with a sealing flange protruding inward, and the sealing flange is used for sealing and blocking the support ring on the outer wall of the container mouth, When the sealing flange is sealed on the support ring of the container, there is a gap between the mouth of the container and the bottom of the valve port, and the sealing valve block above the support ring forms an isobaric cavity that communicates with the return gas pipeline.
The non-contact isobaric filling valve according to claim 14, wherein the outer wall of the valve seat at the valve port is provided with a connecting portion protruding outward, and the inner wall of the upper end of the sealing valve block is provided with a blocking block Step, the sealing valve block and the connecting part are connected in a threaded seal, the bottom of the connecting part is provided with a sealing ring, and the blocking step of the sealing valve block is sealed and blocked on the sealing ring.
The non-contact isobaric filling valve according to claim 14 or 15, wherein the inner diameter of the valve opening is smaller than the inner diameter of the container opening.
The non-contact isobaric filling valve according to claim 14 or 15, characterized in that: when the sealing flange is sealed on the support ring of the container, and the valve is in the closed valve state in which the valve port and the valve cavity are isolated from each other, the return The lower port of the gas conduit extends into the container and is located at the mouth of the container.
The non-contact isobaric filling valve according to claim 14 or 15, wherein when the sealing flange is stuck on the support ring of the container, the gap between the mouth of the container and the bottom of the valve mouth is 2mm ~5mm.
The non-contact isobaric filling valve according to claim 14 or 15, characterized in that an exhaust passage is provided on the valve seat, and the exhaust passage communicates with the valve port below the sealing member.
The non-contact isobaric filling valve according to claim 14 or 15, wherein the bottom surface of the valve body outside the bottom of the valve port is a tapered surface gradually inclined downward from the sealing valve block to the direction of the valve port.